Finding the Fourth Proportional to 12,810.56, 17,679.74 and 7,776.06

Step by Step Solution

1. Step 1: Write the proportion equation
   12,810.56 : 17,679.74 = 7,776.06 : x
2. Step 2: Convert to fraction form
   12,810.56/17,679.74 = 7,776.06/x
3. Step 3: Cross multiply
   12,810.56x = 17,679.74 × 7,776.06
4. Step 4: Simplify right side
   12,810.56x = 137,478,719.02
5. Step 5: Solve for x
   x = 137,478,719.02/12,810.56
6. Step 6: Final answer
   x = 10,731.67